linux-kernel - Re: [PATCH net-next v2 5/6] net: stmmac: Add support for XDP

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Date:   Tue, 30 Mar 2021 19:48:39 -0700
From:   Jakub Kicinski <kuba@...nel.org>
To:     Ong Boon Leong <boon.leong.ong@...el.com>
Cc:     Giuseppe Cavallaro <peppe.cavallaro@...com>,
        Alexandre Torgue <alexandre.torgue@...com>,
        Jose Abreu <joabreu@...opsys.com>,
        "David S . Miller" <davem@...emloft.net>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Jesper Dangaard Brouer <hawk@...nel.org>,
        John Fastabend <john.fastabend@...il.com>,
        Maxime Coquelin <mcoquelin.stm32@...il.com>,
        Andrii Nakryiko <andrii@...nel.org>,
        Martin KaFai Lau <kafai@...com>,
        Song Liu <songliubraving@...com>, Yonghong Song <yhs@...com>,
        KP Singh <kpsingh@...nel.org>, netdev@...r.kernel.org,
        linux-stm32@...md-mailman.stormreply.com,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        bpf@...r.kernel.org
Subject: Re: [PATCH net-next v2 5/6] net: stmmac: Add support for XDP_TX
 action

On Tue, 30 Mar 2021 10:49:48 +0800 Ong Boon Leong wrote:
> +	__netif_tx_lock(nq, cpu);
> +	res = stmmac_xdp_xmit_xdpf(priv, queue, xdpf);
> +	if (res == STMMAC_XDP_TX) {
> +		stmmac_flush_tx_descriptors(priv, queue);
> +		stmmac_tx_timer_arm(priv, queue);
> +	}
> +	__netif_tx_unlock(nq);

You may want to update nq->trans_start, see commit ec107e775d843